The tremor was felt in Chile's south-central region, the same area that was devastated by a massive quake last year. There were no immediate reports of damage, according to Chile's national emergency office.

The USGS said the earthquake struck just before 9 a.m. ET.

A second, weaker quake was reported less than an hour later in the same area, USGS said. It was a magnitude-5.4 temblor and was at a depth of 10.6 miles.